Low Power and Accurate Current Driver IC for Electrical Impedance Tomography Applications

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In this paper, a current driver targeting for Electrical Impedance Tomography is proposed. The proposed IC is designed based on active electrode configuration. First, high output impedance current driver is implemented with phase compensation scheme through a delay-locked loop (DLL) to significantly alleviate a phase shift and a required power consumption in the driver. Second, low-power pseudo-sine wave generator is used not only for a low-harmonic distortion but also for a flexible injection frequency utilization. Third, the calibration unit is proposed to compensate injection-current amplitude variations among active electrodes. As a results, the proposed current driver IC guarantees more than 1 MO output impedance over a wide range of injection current up to 400 mu A and operating frequency from 1 kHz to 5 MHz, only consuming 2.79 mW.
Publisher
IEEK PUBLICATION CENTER
Issue Date
2019-02
Language
English
Article Type
Article
Citation

JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, v.19, no.1, pp.109 - 115

ISSN
1598-1657
DOI
10.5573/JSTS.2019.19.1.109
URI
http://hdl.handle.net/10203/261849
Appears in Collection
EE-Journal Papers(저널논문)
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